Static testing and predicting method for shell stiffened structure

Abstract

The invention belongs to the field of static testing and predicting, and particularly relates to a static testing and predicting method for a shell stiffened structure. Under different load actions and different boundary treatment ways, the static predicting simulation result of the structure is compared with the testing data. Systematic comparison and comprehensive evaluation of correlated errors, which are conducted on static testing and static predicting simulation, are achieved, and the problem that in the past, only extremely specific feature points are subjected to data analysis and comparison is solved; impact factor data of real test or simulation are calculated through contrastive analysis in different grades and accumulation of different boundary simulation ways, different solving ways and different testing methods; and the relation between testing and predicting can be intuitively responded through comparison of cloud charts, curves and similarities, and whether a test is conducted continuously or not, whether a test piece is needed or not and whether human and property are security or not can be determined through evaluation of data.

Description

technical field [0001] The technology belongs to the field of static test and prediction, and specifically relates to a static test and prediction method for a shell reinforced structure. Background technique [0002] The structural strength and stiffness of the launch vehicle are important assessment objects in the development process. At present, we mainly use three methods to analyze: 1. Engineering algorithm analysis; 2. Finite element prediction simulation analysis; 3. Entity static test assessment. Engineering algorithm analysis is mainly used to evaluate the macroscopic strength and stiffness of the structure at the early stage of design. It is characterized by simple application, low cost, less calculation time, almost no visual display, poor accuracy, and the overall trend of the analysis results is correct. However, for launch vehicles such as Products require a high load-carrying ratio of structural unit mass, and more and more fine-grained structural design is re...

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Problems solved by technology

However, due to the following situations in the actual operation process: 1. High cost; 2. The measurement data is limited, so it is impossible to measure all the points of interest; 3. The measurement space is limited, and the area where the measurement sensor cannot be arranged (the surface curvature is too large) Large and small closed spaces) are unable to obtain measurement data; 4. When applying loads or boundary constraints, other auxiliary tooling is inevitably needed. These toolings usually have a partial difference in stiffness from the boundary stiffness in the real environment. However, boundary factors have a significant impact on the structure 5. Other environmental reasons are unavoidable, such as temperature changes and wind load changes.

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